can you still run reg non lsd- ulsd in an 06 lbz? I travel down to Mexico from time to time, my friend lives in cabo and has run their diesel in his 05 f-350 since it was new with no probs.

Yes.

The new engines that Have to use the Ultra low sulfur diesel wont be coming out till the end of the year.

They will have particulate filters that would clog with the old low sulfur fuel.

.

The beauty of an 07 classic or older. Will burn any diesel.